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comparison dynload/dynload_syms_pe.c @ 0:3e629dc19168

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initial from svn dyncall-1745
author Daniel Adler
date Thu, 19 Mar 2015 22:24:28 +0100
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children 6c7591cef6a8
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-1:000000000000 0:3e629dc19168
1 /*
2
3 Package: dyncall
4 Library: dynload
5 File: dynload/dynload_syms_pe.c
6 Description:
7 License:
8
9 Copyright (c) 2007-2015 Daniel Adler <dadler@uni-goettingen.de>,
10 Tassilo Philipp <tphilipp@potion-studios.com>
11 Olivier Chafik <olivier.chafik@gmail.com>
12
13 Permission to use, copy, modify, and distribute this software for any
14 purpose with or without fee is hereby granted, provided that the above
15 copyright notice and this permission notice appear in all copies.
16
17 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
18 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
19 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
20 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
21 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
22 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
23 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
24
25 */
26
27
28
29 #include "dynload.h"
30 #include "dynload_alloc.h"
31
32 #include <windows.h>
33
34 struct DLLib_
35 {
36 IMAGE_DOS_HEADER dos_header;
37 };
38
39
40 struct DLSyms_
41 {
42 DLLib* pLib;
43 const char* pBase;
44 const DWORD* pNames;
45 const DWORD* pFuncs;
46 const unsigned short* pOrds;
47 size_t count;
48 };
49
50
51 DLSyms* dlSymsInit(const char* libPath)
52 {
53 DLLib* pLib = dlLoadLibrary(libPath);
54 DLSyms* pSyms = (DLSyms*)dlAllocMem(sizeof(DLSyms));
55 const char* base = (const char*) pLib;
56 IMAGE_DOS_HEADER* pDOSHeader = (IMAGE_DOS_HEADER*) base;
57 IMAGE_NT_HEADERS* pNTHeader = (IMAGE_NT_HEADERS*) ( base + pDOSHeader->e_lfanew );
58 IMAGE_DATA_DIRECTORY* pExportsDataDir = &pNTHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT];
59 IMAGE_EXPORT_DIRECTORY* pExports = (IMAGE_EXPORT_DIRECTORY*) (base + pExportsDataDir->VirtualAddress);
60
61 pSyms->pBase = base;
62 pSyms->pNames = (DWORD*)(base + pExports->AddressOfNames);
63 pSyms->pFuncs = (DWORD*)(base + pExports->AddressOfFunctions);
64 pSyms->pOrds = (unsigned short*)(base + pExports->AddressOfNameOrdinals);
65 pSyms->count = (size_t)pExports->NumberOfNames;
66 pSyms->pLib = pLib;
67
68 return pSyms;
69 }
70
71
72 void dlSymsCleanup(DLSyms* pSyms)
73 {
74 if(pSyms) {
75 dlFreeLibrary(pSyms->pLib);
76 dlFreeMem(pSyms);
77 }
78 }
79
80
81 int dlSymsCount(DLSyms* pSyms)
82 {
83 return (int)pSyms->count;
84 }
85
86
87 const char* dlSymsName(DLSyms* pSyms, int index)
88 {
89 return (const char*)((const char*)pSyms->pBase + pSyms->pNames[index]);
90 }
91
92
93 void* dlSymsValue(DLSyms* pSyms, int index)
94 {
95 return (void*)(pSyms->pBase + pSyms->pFuncs[pSyms->pOrds[index]]);
96 }
97
98
99 const char* dlSymsNameFromValue(DLSyms* pSyms, void* value)
100 {
101 int i, c=dlSymsCount(pSyms);
102 for(i=0; i<c; ++i)
103 {
104 if(dlSymsValue(pSyms, i) == value)
105 return dlSymsName(pSyms, i);
106 }
107
108 /* Not found. */
109 return NULL;
110 }